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2015

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Articles 9481 - 9510 of 9578

Full-Text Articles in Physical Sciences and Mathematics

Stream Bank Erosion Trends And Sediment Contributions In A Southwestern Missouri River, Ezekiel Allen Kuehn Jan 2015

Stream Bank Erosion Trends And Sediment Contributions In A Southwestern Missouri River, Ezekiel Allen Kuehn

Graduate Theses/Dissertations

Bank erosion can be a significant source of in-stream sediment that negatively affects water quality and aquatic habitat. However, assessments of the role that eroding banks play in suspended and bed sediment supply are rarely available to managers. The purpose of this study was to quantify bank erosion rates for a 7 km conservation easement the James River in southwest Missouri to evaluate the annual contributions of bank sediment to the channel. The objectives were to: (1) monitor an eroding 260 m bank to better understand short-term, reach scale bank erosion rates; (2) determine historical rates of bank erosion for …


Gravity And Magnetic Investigations Into Possible Economic Mineral Deposits Within The Northwest St. Francois Terrane, Southeastern Missouri, Brandon Todd Ives Jan 2015

Gravity And Magnetic Investigations Into Possible Economic Mineral Deposits Within The Northwest St. Francois Terrane, Southeastern Missouri, Brandon Todd Ives

Graduate Theses/Dissertations

The exposed Precambrian St. Francois Mountains in southeast Missouri are a well-studied terrane of rhyolites, granites, and basaltic dikes, but much of the buried basement lithology west of the exposed region is still poorly delineated. The western St. Francois is host to large hydrothermal Pb-Zn and Fe-oxide ore deposits, some of which were located with previous geophysical investigations. The economic ore deposits specifically in the Pea Ridge Mine in Washington County contain known economic minerals and rare earth element deposits. In order to further investigate the Precambrian basement lithologies and the possible locations of additional economic ore deposits, a gravity …


Prospects For Detection Of Extragalactic Stellar Black Hole Binaries In The Nearby Universe, Matthew Benacquista, Jesus Hinojosa, Alberto Mata, Krzysztof Belczynski Jan 2015

Prospects For Detection Of Extragalactic Stellar Black Hole Binaries In The Nearby Universe, Matthew Benacquista, Jesus Hinojosa, Alberto Mata, Krzysztof Belczynski

Physics & Astronomy Faculty Publications

Stellar mass black hole binaries have individual masses between 10-80 solar masses. These systems may emit gravitational waves at frequencies detectable at Megaparsec distances by space-based gravitational wave observatories. In a previous study, we determined the selection effects of observing these systems with detectors similar to the Laser Interferometer Space Antenna by using a generated population of binary black holes that covered a reasonable parameter space and calculating their signal-to-noise ratio. We further our study by populating the galaxies in our nearby (less than 30 Mpc) universe with binary black hole systems drawn from a distribution found in the Synthetic …


Understanding The Gravitational-Wave Hellings And Downs Curve For Pulsar Timing Arrays In Terms Of Sound And Electromagnetic Waves, Fredrick A. Jenet, Joseph D. Romano Jan 2015

Understanding The Gravitational-Wave Hellings And Downs Curve For Pulsar Timing Arrays In Terms Of Sound And Electromagnetic Waves, Fredrick A. Jenet, Joseph D. Romano

Physics & Astronomy Faculty Publications

Searches for stochastic gravitational-wave backgrounds using pulsar timing arrays look for correlations in the timing residuals induced by the background across the pulsars in the array. The correlation signature of an isotropic, unpolarized gravitational-wave background predicted by general relativity follows the so-called Hellings and Downs curve, which is a relatively simple function of the angle between a pair of Earth-pulsar baselines. In this paper, we give a pedagogical discussion of the Hellings and Downs curve for pulsar timing arrays, considering simpler analogous scenarios involving sound and electromagnetic waves. We calculate Hellings-and-Downs-type functions for these two scenarios and develop a framework …


Detection Of Temporal Changes In Vegetative Cover On South Padre Island, Texas Using Image Classifications Derived From Aerial Color-Infrared Photographs, Ruben A. Mazariegos, Kenneth R. Summy, Frank W. Judd, Robert I. Lonard, James H. Everitt Jan 2015

Detection Of Temporal Changes In Vegetative Cover On South Padre Island, Texas Using Image Classifications Derived From Aerial Color-Infrared Photographs, Ruben A. Mazariegos, Kenneth R. Summy, Frank W. Judd, Robert I. Lonard, James H. Everitt

Physics & Astronomy Faculty Publications

Supervised image classifications developed from 23 x 23 cm aerial color-infrared aerial photographs (1:5,000 scale) were used to evaluate temporal changes in vegetative cover occurring within three 150 x 300-m research sites on South Padre Island, Texas. Use of high-resolution digitized imagery (ground pixel resolution of ca. 0.1 m) and survey-grade GPS for positional measurements of ground control points (20-25 1.0m2 targets within each research site) resulted in consistently high levels of geometric accuracy, with root mean square errors (RMSEs) ranging between 0.397 – 2.867. Similarly, use of relatively simple information categories (dry and wet sand, live and dead vegetative …


The Mass Profile And Shape Of Bars In The Spitzer Survey Of Stellar Structure In Galaxies (S4g) : Search For An Age Indicator For Bars., Taehyun Kim, Kartik Sheth, Dimitri A. Gadotti, Myung Gyoon Lee, Dennis Zaritsky, Bruce G. Elmegreen, E. Athanassoula, Albert Bosma, Benne W. Holwerda, Luis C. Ho, Sebastien Comeron, Johan H. Knapen, Joannah Hinz, Juan Carlos Munoz-Mateos, Santiago Erroz-Ferrer, Ronald J. Buta, Minjin Kim, Eija Laurikainen, Heikki Salo, Barry F. Madore, Jarkko Laine, Karin Menendez-Delmestre, Michael Regan, Bonita De Swardt, Armando Gil De Paz, Mark Seibert, Trisha Mizusawa Jan 2015

The Mass Profile And Shape Of Bars In The Spitzer Survey Of Stellar Structure In Galaxies (S4g) : Search For An Age Indicator For Bars., Taehyun Kim, Kartik Sheth, Dimitri A. Gadotti, Myung Gyoon Lee, Dennis Zaritsky, Bruce G. Elmegreen, E. Athanassoula, Albert Bosma, Benne W. Holwerda, Luis C. Ho, Sebastien Comeron, Johan H. Knapen, Joannah Hinz, Juan Carlos Munoz-Mateos, Santiago Erroz-Ferrer, Ronald J. Buta, Minjin Kim, Eija Laurikainen, Heikki Salo, Barry F. Madore, Jarkko Laine, Karin Menendez-Delmestre, Michael Regan, Bonita De Swardt, Armando Gil De Paz, Mark Seibert, Trisha Mizusawa

Faculty and Staff Scholarship

We have measured the radial light profiles and global shapes of bars using two-dimensional 3.6μm image decompositions for 144 face-on barred galaxies from the Spitzer Survey of Stellar Structure in Galaxies. The bar surface brightness profile is correlated with the stellar mass and bulge-to-total (B/T) ratio of their host galaxies. Bars in massive and bulge-dominated galaxies (B/T > 0.2) show a flat profile, while bars in less massive, disk-dominated galaxies (B/T ∼ 0) show an exponential, disk-like profile with a wider spread in the radial profile than in the bulge-dominated galaxies. The global two-dimensional shapes of bars, however, are rectangular/boxy, independent …


Aspects Of Fourier Analysis On Euclidean Space, Joseph William Roberts Jan 2015

Aspects Of Fourier Analysis On Euclidean Space, Joseph William Roberts

Graduate Theses/Dissertations

The field of Fourier analysis encompasses a vast spectrum of mathematics and has far reaching applications in all STEM fields. Here we introduce and study the Fourier transform and Fourier series on Euclidean space. After defining the Fourier transform, establishing its basic properties, and presenting some classical results we looked into what impact the smoothness of a function has on the growth and integrability of its Fourier transform. This endeavor also involved a brief study of Bessel functions and interpolation of operators. Having established several results indicating that the behavior of a function's Fourier transform is largely dictated by the …


Vitis Gene Expression Profiling Using Mixed Models, Yin Yin Jan 2015

Vitis Gene Expression Profiling Using Mixed Models, Yin Yin

Graduate Theses/Dissertations

The purpose of this thesis is to analyze gene expression in grapevine under different treatments using a mixed linear statistical model. The experiment involves two Vitis species (V. vinifera Cabernet sauvignon and V. aestivalis Norton) and applies two different treatments to them (inoculation with Erysiphe necator conidiospores and mock inoculation). There are three biological replicates measured at each of the following six assigned time points: 0, 4, 8, 12, 24, and 48 hours. By setting up split-plot model for the data, statistical hypotheses concerning gene expressions, especially gene expressions in terms of treatment effect, are tested. The result of the …


Understanding The Physiological Effects Of Suspended Material On Rainbow Trout (Oncorhynchus Mykiss), Tyler J. Weinhardt Jan 2015

Understanding The Physiological Effects Of Suspended Material On Rainbow Trout (Oncorhynchus Mykiss), Tyler J. Weinhardt

Theses and Dissertations (Comprehensive)

The effect of global warming on northern environments is becoming increasingly evident. Melting of underlying permafrost is associated with widespread impacts in these environments. The loss of permafrost results in a destabilizing of underlying sedimentary layers resulting in thermokarst slumping. When this occurs on a large scale (mega-slumping) soil material becomes mobilized and is carried into local streams and rivers. The purpose of this study is to examine the sub-lethal physiological effects that suspended material has on rainbow trout (Oncorhynchus mykiss) in the context of the Peel River Plateau. Juvenile rainbow trout were exposed (following Environment Canada exposure …


Examination Of Field Scale Hydrological Processes Under Three Different Tillage Methods In Southern Ontario: Conventional Till (Ct); Modified Till (Mt); And No Till (Nt), Ian Martin Jan 2015

Examination Of Field Scale Hydrological Processes Under Three Different Tillage Methods In Southern Ontario: Conventional Till (Ct); Modified Till (Mt); And No Till (Nt), Ian Martin

Theses and Dissertations (Comprehensive)

In the wake of the severe algal blooms of 2011 and 2013 in the Great Lakes, international governing bodies such as the United Nations, are advocating for increased studies on nutrient dynamics within agricultural systems. Understanding farm contributions to nutrient loads entering the Great Lakes involves quantifying nutrient export from different tillage practices common in the Great Lakes basin, which include no-till (NT), conventional till (CT) and modified tillage (MT). Understanding differences in nutrient export from different tillage practices may well be related to structural differences in the upper portion of the vadose zone which impact infiltration, soil moisture and …


Dune And Coastal Evolution In Isla Salamanca National Park, Colombia, Juan Felipe Gómez Jan 2015

Dune And Coastal Evolution In Isla Salamanca National Park, Colombia, Juan Felipe Gómez

Theses and Dissertations (Comprehensive)

This project analyzes natural variables influencing the coastal and dune evolution in Isla Salamanca National Park (ISNP), a biosphere reserve and Ramsar site located in Colombia, on the Caribbean coast. Since at least the early 1950s, the park has been affected by eroding trends along most of the shoreline. Particularly, most modern dunes are located close to the coastline, forming scarped dunes regularly affected by storm wave-action.

The trends through time of rain, bathymetry and coastline changes during the last six decades were studied through statistical analysis, mapping of landscape features, and satellite images and historical aerial photograph …


Community Detection Detailed For Online Social Networks, Christopher J. Hogan Jan 2015

Community Detection Detailed For Online Social Networks, Christopher J. Hogan

Theses and Dissertations (Comprehensive)

Ever since the internet became publicly available it has allowed users to interact with each other across virtual networks. With this large amounts of data being collected the clustering of this information has become an even more powerful tool for recognize patterns and trends in a network. In this research we look build a model for Community Detection in these online social networks. We combine the ideas from both discrete mathematics and sociology, to build an algorithm with the specific intent on discovering communities that exist in an online social network. We present many of the sociology theories behind the …


Urban Flood Response Planning: Building Urban Resilience In Calgary And Toronto, Sarah Asrat Jan 2015

Urban Flood Response Planning: Building Urban Resilience In Calgary And Toronto, Sarah Asrat

Theses and Dissertations (Comprehensive)

Flooding is an increasing environmental concern for many Canadian cities. There is increasing awareness of climate change and its impacts on precipitation behavior and flooding in urban areas. Knowledge gaps were identified in the literature concerning urban flood response planning, uncertainty and preparedness planning. This study examines and compares urban flood response measures and resilience building for natural disasters in the Cities of Toronto and Calgary. Non-structural measures for flood risk reduction that include policies, decision-making and community engagement were examined by conducting a literature review and semi-structured interviews of individuals from six groups: provincial government, municipal government, conservation authority, …


Big Data -- A 21st Century Science Maginot Line? No-Boundary Thinking: Shifting From The Big Data Paradigm, Xiuzhen Huang, Steven F. Jennings, Barry Bruce, Alison Buchan, Liming Cai, Pengyin Chen, Carole Cramer, Weihua Guan, Uwe Kk Hilgert, Hongmei Jiang, Zenglu Li, Gail Mcclure, Donald F. Mcmullen, Bindu Nanduri, Andy Perkins, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Karl Walker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Yu Zhang, Zhongming Zhao, Jason H. Moore Jan 2015

Big Data -- A 21st Century Science Maginot Line? No-Boundary Thinking: Shifting From The Big Data Paradigm, Xiuzhen Huang, Steven F. Jennings, Barry Bruce, Alison Buchan, Liming Cai, Pengyin Chen, Carole Cramer, Weihua Guan, Uwe Kk Hilgert, Hongmei Jiang, Zenglu Li, Gail Mcclure, Donald F. Mcmullen, Bindu Nanduri, Andy Perkins, Bhanu Rekepalli, Saeed Salem, Jennifer Specker, Karl Walker, Donald C. Wunsch, Donghai Xiong, Shuzhong Zhang, Yu Zhang, Zhongming Zhao, Jason H. Moore

Electrical and Computer Engineering Faculty Research & Creative Works

Whether your interests lie in scientific arenas, the corporate world, or in government, you have certainly heard the praises of big data: Big data will give you new insights, allow you to become more efficient, and/or will solve your problems. While big data has had some outstanding successes, many are now beginning to see that it is not the Silver Bullet that it has been touted to be. Here our main concern is the overall impact of big data; the current manifestation of big data is constructing a Maginot Line in science in the 21st century. Big data is not …


Cip10 Optimization For 4,4-Methylene Diphenyl Diisocyanate Aerosol Sampling And Field Comparison With Impinger Method, Silvia Puscasu, Simon Aubin, Yves Cloutier, Philippe Sarazin, Huu Van Tra, Sébastien Gagné Jan 2015

Cip10 Optimization For 4,4-Methylene Diphenyl Diisocyanate Aerosol Sampling And Field Comparison With Impinger Method, Silvia Puscasu, Simon Aubin, Yves Cloutier, Philippe Sarazin, Huu Van Tra, Sébastien Gagné

Études primaires

4,4-methylene diphenyl diisocyanate (MDI) aerosol exposure evaluation in spray foam insulation application is known as being a challenge because the spray foam application actually involves a fast-curing process. Available techniques are either not user-friendly or are inaccurate or not validated for this application. To address these issues, a new approach using a CIP10M was developed to appropriately collect MDI aerosol in spray foam insulation while being suitable for personal sampling. The CIP10M is a commercially available personal aerosol sampler that has been validated for the collection of microbial spores into a liquid medium. Tributylphosphate with 1-(2-methoxyphenyl)piperazine (MOPIP) was introduced into …


Development Of Platinum-Based Catalysts On Polyimide Films For Alcohol Electro-Oxidation, Rungnahpa Ruangsariyanon Jan 2015

Development Of Platinum-Based Catalysts On Polyimide Films For Alcohol Electro-Oxidation, Rungnahpa Ruangsariyanon

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research studied the preparation of highly dispersed platinum nanoparticles on polyimide films or Pt/PI by surface modification method. Firstly, polyimide film was hydrolyzed in basic solution, followed by being immersed in platinum-ion solution to allow ion exchange process. Platinum ions on the film were subsequently reduced using proper reducing agent to give Pt/PI. After that, morphological and other information of the Pt/PI was investigated by X-ray diffraction analysis, scanning electron microscopy-energy dispersive X-ray spectroscopy, transmission electron microscopy, and inductively coupled plasma-optical emission spectroscopy. Electrochemical performance of the Pt/PI for the electro-oxidation of alcohols was investigated by means of cyclic …


Development Of Dual-Bacterial Culture For Benzene Degradation And Biofilm Formation, Aiyarucht Techajindamanee Jan 2015

Development Of Dual-Bacterial Culture For Benzene Degradation And Biofilm Formation, Aiyarucht Techajindamanee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Dual bacterial culture is the technique using the different characteristic of two bacteria for support the bacterial culture ability. This study developed the dual culture of benzene-degrading bacteria and biofilm-forming bacteria, and optimized the culture conditions promoting their benzene degradation and biofilm formation for increasing benzene-removal efficiency and bacterial stability in benzene treatment systems. Acinetobacter sp. B36 was a benzene-degrading and biofilm-forming bacterium isolated from petroleum wastewater. The bacterial biofilm was promoted by dual-culturing with Pseudomonas sp. BF6 isolated from the same source. The optimum culture conditions were studied focused on co-carbon source, nitrogen source, oxygen and metal ion. The …


ประสิทธิภาพในการย่อยสลายน้ำมันดิบของกลุ่มแบคทีเรียที่คัดแยกจากดินตะกอนอ่าวไทย, ปิยะนุช อยู่คล้ำ Jan 2015

ประสิทธิภาพในการย่อยสลายน้ำมันดิบของกลุ่มแบคทีเรียที่คัดแยกจากดินตะกอนอ่าวไทย, ปิยะนุช อยู่คล้ำ

Chulalongkorn University Theses and Dissertations (Chula ETD)

อ่าวไทยจัดเป็นศูนย์กลางทางด้านการท่องเที่ยวและอุตสาหกรรมหลักที่สำคัญของประเทศ จึงมีแนวโน้มในการปนเปื้อนของปิโตรเลียมไฮโดรคาร์บอนได้ งานวิจัยนี้มีวัตถุประสงค์เพื่อคัดแยกกลุ่มแบคทีเรียที่มีประสิทธิภาพในการย่อยสลายน้ำมันดิบจากตัวอย่างดินตะกอนบริเวณอ่าวไทย ทดสอบประสิทธิภาพของกลุ่มแบคทีเรียในการย่อยสลายน้ำมันในสภาวะแวดล้อมต่างๆ และศึกษาบทบาทของแบคทีเรียในกลุ่ม โดยจาก 45 สถานีตัวอย่าง ตรวจนับจำนวนแบคทีเรียย่อยสลายน้ำมันดิบได้มีค่าอยู่ในช่วง 2.3x105 - 1.10x107MPN /g น้ำหนักเปียก และแบ่งตัวอย่างตามลักษณะพื้นที่และลักษณะทางกายภาพได้เป็น 14 กลุ่มตัวอย่าง คือ G1-G14 ผลการทดลองพบว่าสามารถเพิ่มจำนวนแบคทีเรียที่ย่อยสลายน้ำมันดิบได้จากทั้ง 14 กลุ่มตัวอย่างด้วยเทคนิคเอนริชเมนท์ โดยกลุ่มแบคทีเรีย G11 ซึ่งมีประสิทธิภาพในการย่อยสลายน้ำมันดิบได้สูงที่สุด สามารถย่อยสลายน้ำมันดิบ 0.5% (v/v) ได้ 80 % ภายในระยะเวลา 5 วัน นอกจากนี้พบว่า G11 มีเปอร์เซ็นต์ความไม่ชอบน้ำของเซลล์สูงที่สุดประมาณ 74% และยังตรวจพบยีนที่เกี่ยวข้องในการย่อยสลายน้ำมันดิบได้หลากหลาย และการทดสอบประสิทธิภาพของ G11 ที่สภาวะต่างๆ พบว่า G11 สามารถย่อยสลายน้ำมันประเภทต่างๆ ได้แก่ น้ำมันดีเซล น้ำมันเตา น้ำมันหล่อลื่นเครื่องยนต์ดีเซลกึ่งสังเคราะห์ น้ำมันหล่อลื่นเครื่องยนต์เบนซินสังเคราะห์ น้ำมันแก๊สโซฮอลล์ 91 (E91) น้ำมันแก๊สโซฮอลล์ 95 (E95) ที่ความเข้มข้น 4,000 มิลลิกรัม/ลิตรได้ดี สามารถย่อยสลายน้ำมันดิบในช่วงความเข้มข้น 4-32 กรัม/ลิตรได้เกือบ 100% ระยะเวลา 12 วัน โดยมีอัตราการกำจัดน้ำมันดิบได้สูงสุด 6.75 กรัม/ลิตร/กรัมเซลล์/วัน ที่ความเข้มข้นน้ำมันดิบ 24 กรัม/ลิตร สามารถย่อยสลายเตตระเดกเคน เฮกซะเดกเคน และ PAHs ผสม ซึ่งได้แก่ แอนทราซีน ฟีแนนทรีน ฟลูออแรนทีน และไพรีนได้ นอกจากนี้ยังพบว่า G11 ยังสามารถย่อยสลายน้ำมันดิบ 0.5 % (v/v) ได้ดีในสภาวะที่มีการแปรผันค่าความเค็มในช่วง 20 - >100 ppt ช่วงพีเอชตั้งแต่ 3-9 และอุณหภูมิ 30-37 oซ ซึ่งจากการวิเคราะห์ประชาคมแบคทีเรียโดยการเพาะเลี้ยงและการไม่เพาะเลี้ยงพบว่าในทุกช่วงการย่อยสลายในทุกสภาวะ มี …


Spatio-Temporal Patterns Of Water Table And Vegetation Status Of A Deserted Area, Limin Duan, Tingxi Liu, Xixi Wang, Yanyun Luo Jan 2015

Spatio-Temporal Patterns Of Water Table And Vegetation Status Of A Deserted Area, Limin Duan, Tingxi Liu, Xixi Wang, Yanyun Luo

Civil & Environmental Engineering Faculty Publications

Understanding groundwater-vegetation interactions is crucial for sustaining fragile environments of desert areas such as the Horqin Sandy Land (HSL) in northern China. This study examined spatio-temporal variations in the water table and the associated vegetation status of a 9.71 km2 area that contains meadowland, sandy dunes, and intermediate transitional zones. The depth of the water table and hydrometeorologic parameters were monitored and Landsat Thematic Mapper (TM) and Moderate Resolution Imaging Spectroradiometer (MODIS) data were utilized to assess the vegetation cover. Spatio-temporal variations over the six-year study period were examined and descriptive groundwater-vegetation associations developed by overlaying a water table …


Interplay Of Porous Media And Fracture Stimulation In Sedimentary Enhanced Geothermal Systems : Red River Formation, Williston Basin, North Dakota, Caitlyn M. Hartig Jan 2015

Interplay Of Porous Media And Fracture Stimulation In Sedimentary Enhanced Geothermal Systems : Red River Formation, Williston Basin, North Dakota, Caitlyn M. Hartig

Theses and Dissertations

Fracture stimulated enhanced geothermal systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is possible there because temperatures in the formation surpass 140° Celsius and the permeability is 0.1-38 mD; fracture stimulation can be utilized to improve performance. The main objectives of this project were 1) to determine the spatial variation of the intrinsic properties of the Red River Formation across the study area, and 2) to understand the …


The Effect Of Milling Additives On Powder Properties And Sintered Body Microstructure Of Nio, L. Jay Deiner, Michael A. Rottmayer, Bryan C. Eigenbrodt Jan 2015

The Effect Of Milling Additives On Powder Properties And Sintered Body Microstructure Of Nio, L. Jay Deiner, Michael A. Rottmayer, Bryan C. Eigenbrodt

Publications and Research

The evolution of powder particle size, crystal structure, and surface chemistry was evaluated for micron scale NiO powders subjected to impact milling with commonly employed milling additives: methanol, Vertrel XF, and amorphous carbon. The effect of the different comminution protocols on sintered body microstructure was evaluated for high temperature sintering in inert atmosphere (N2). X-ray photoelectron spectroscopy showed that NiO powder surface chemistry is surprisingly sensitive to milling additive choice. In particular, the proportion of powder surface defect sites varied with additive, and methanol left an alcohol or alkoxy residue even after drying. Upon sintering to intermediate temperatures (1100 ℃), …


Phenomenology Of A Toy Model Inspired By The Spontaneous Reduction Of The Spectral Dimension In Quantum Gravity, Patrick A. Greene Jan 2015

Phenomenology Of A Toy Model Inspired By The Spontaneous Reduction Of The Spectral Dimension In Quantum Gravity, Patrick A. Greene

Honors Theses and Capstones

Attempts to formulate a quantum theory of gravity have generated many sophisticated models. Though fundamentally different, they necessarily exhibit behaviors resembling experimental observations and standard theoretical expectations. Often, their similarities go no further. However many models unexpectedly predict a change in the spectral dimension of spacetime at very small scales (See [1] and references therein for examples). In particular, some of the models predict the spectral dimension changes from 4 to 2. This paper investigates the phenomenological consequences of a toy model that use Planck-scale 2D hypersurfaces, specifically triangles, embedded in 4D Minkowski spacetime. We randomly generated sequences of triangles …


Role Of Small Molecules In Rescuing Protein Folding Under Oxidative Stress, Mahmoud Fawzi Megahed Helal Khalil Jan 2015

Role Of Small Molecules In Rescuing Protein Folding Under Oxidative Stress, Mahmoud Fawzi Megahed Helal Khalil

Open Access Theses & Dissertations

Increased levels of nitrosative stress intracellularly within the endoplasmic reticulum is a key factor involvled in the pathogenesis of both Parkinson's (PD) and Alzheimer's (AD) diseases. Previous in-vitro studies in our lab showed that increased levels of nitrosative stress lead to aggregation of misfolded proteins and formation of Lewy Bodies, the main biomarker of PD and AD diseases. Although this was mainly through nitrosylation of Protein Disulfide Isomerase (PDI), the chief endoplasmic reticulum (ER) resident oxidoreductase chaperone responsible for maturation of disulfide-bond-containing proteins, we demonstrate in this project that increased levels of nitrosative stress has an additional direct effect on …


Towards Analytical Techniques For Optimizing Knowledge Acquisition, Processing, Propagation, And Use In Cyberinfrastructure, Leonardo Octavio Lerma Jan 2015

Towards Analytical Techniques For Optimizing Knowledge Acquisition, Processing, Propagation, And Use In Cyberinfrastructure, Leonardo Octavio Lerma

Open Access Theses & Dissertations

For many decades, there has been a continuous progress in science and engineering applications.

A large part of this progress comes from the new knowledge that researchers acquire, propagate, and use. This new knowledge has revolutionized many aspects of our life, from driving to communications to shopping.

Somewhat surprisingly, there is one area of human activity which is the least impacted by the modern technological progress: the very processes of acquiring, processing, and propagating information. When we decide where to place sensors, which algorithm to use for processing the data – we rely mostly on our own intuition and on …


Synthesis Of Benzofused-P-Indolequinones From 1,4-Naphthoquinone And Selective N-Debenzylation By Dess-Martin Periodinane, Quang Huynh Luu Jan 2015

Synthesis Of Benzofused-P-Indolequinones From 1,4-Naphthoquinone And Selective N-Debenzylation By Dess-Martin Periodinane, Quang Huynh Luu

Open Access Theses & Dissertations

p-Indolequinones are important heterocycles since they display interesting bioactivities such as anticancer activities as well as the ability to trigger drug release in drug targeting research. Additionally, they are also useful in precursors for the synThesis of bioactive compounds. Over decades, many methodologies have been investigated for the synThesis of p-indolequinones. Among those, cyclization of quinones plays an important role in convenient synThesis of these compounds. However, the great majority of these methods only describe quinones as electrophiles in cyclization. In our research, we found an intramolecular nucleophilic attack of quinone to an in-situ generated carbonyl group and developed a …


Does Low-Level Arsenic Exposure Predict Blood Pressure In Children?, Tania Angelica Mayorga Jan 2015

Does Low-Level Arsenic Exposure Predict Blood Pressure In Children?, Tania Angelica Mayorga

Open Access Theses & Dissertations

Background & Significance: Inorganic arsenic is a heavy metal naturally found in soil and human exposure to this heavy metal causes adverse effects. Exposure risks are particularly high in developing children. Arsenic is mainly found in bedrock. It is also a by-product of smelting, it is used in cement production, and historically is has been found in crop pesticides. Among other ill-effects, arsenic exposure in humans can cause respiratory diseases, peripheral neuropathy and liver fibrosis. In particular arsenic has been shown in many studies to be a contributing factor in the risk for hypertension in adults however no studies have …


High Performance Computing In Air Quality Models An Their Applications, Roberto A. Perea Jan 2015

High Performance Computing In Air Quality Models An Their Applications, Roberto A. Perea

Open Access Theses & Dissertations

High Performance Computing has become an important tool for many applications and services in the areas of Air Quality research. One important aspect is the use of computational technology in simulation and modeling of complex Air Quality models which makes it affordable in terms of data analysis, processing and speed. For this Dissertation, three projects using Air quality models were developed using high performance computing.

For the first project, ozone concentrations for the Paso del Norte Region are simulated using air quality models and compared against experimental data. For the second project, the Development of models and optimization of codes …


Framing The Question, "Who Governs The Internet?", Robert J. Domanski Jan 2015

Framing The Question, "Who Governs The Internet?", Robert J. Domanski

Publications and Research

There remains a widespread perception among both the public and elements of academia that the Internet is “ungovernable”. However, this idea, as well as the notion that the Internet has become some type of cyber-libertarian utopia, is wholly inaccurate. Governments may certainly encounter tremendous difficulty in attempting to regulate the Internet, but numerous types of authority have nevertheless become pervasive. So who, then, governs the Internet? This book will contend that the Internet is, in fact, being governed, that it is being governed by specific and identifiable networks of policy actors, and that an argument can be made as to …


Proceedings Of The 2nd Annual Cuny Games Festival, Robert O. Duncan, Joe Bisz, Francesco Crocco, Carlos Hernandez, Kathleen Offenholley, Maura A. Smale, Deborah Sturm, Cuny Games Network Jan 2015

Proceedings Of The 2nd Annual Cuny Games Festival, Robert O. Duncan, Joe Bisz, Francesco Crocco, Carlos Hernandez, Kathleen Offenholley, Maura A. Smale, Deborah Sturm, Cuny Games Network

Publications and Research

Proceedings of the CUNY Games Conference, held from January 16-17, 2015, at the CUNY Graduate Center and Borough of Manhattan Community College.

Health Games - Language and Composition - Design: Classroom Considerations - Games in the Physical Environment - Games and Behavioral Science - Play, Politics & Economics - Gaming Curricula, Disciplines & Programs - Gaming and History - Institutional Programming with Games - Philosophy and Roleplaying - Ed. Game Design: Strategy & Tactics - Repurposing Game Genres - Narrative, Storytelling & Games - Community & Social Justice - Extemporaneity - Personal & Social Transformation - Cognition, Design & Play …


Differentiability Of Correlations In Realistic Quantum Mechanics, Alejandro Cabrera, Edson De Faria, Enrique Pujals, Charles Tresser Jan 2015

Differentiability Of Correlations In Realistic Quantum Mechanics, Alejandro Cabrera, Edson De Faria, Enrique Pujals, Charles Tresser

Publications and Research

We prove a version of Bell’s theorem in which the locality assumption is weakened. We start by assuming theoretical quantum mechanics and weak forms of relativistic causality and of realism (essentially the fact that observable values are well defined independently of whether or not they are measured). Under these hypotheses, we show that only one of the correlation functions that can be formulated in the framework of the usual Bell theorem is unknown. We prove that this unknown function must be differentiable at certain angular configuration points that include the origin. We also prove that, if this correlation is assumed …